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Blanket octopuses are immune to the poisonous Portuguese man o' war, whose tentacles the male and immature females rip off and use for defensive purposes. Also, unlike many other octopuses, the blanket octopus does not use ink to intimidate potential predators. When threatened, the female unfurls her large net-like membranes that spread out and billow in the water, greatly increasing her apparent size. Image Credit: Dhugal Lindsay/JAMSTEC/CMarZ, CC BY-NC-SA http://eol.org/data_objects/13144381